//指针笔试题3
#include <stdio.h>

int main()
{
    int a[4] = {1, 2, 3, 4};
    int* ptr1 = (int*)(&a + 1);
    int* ptr2 = (int*)((int)a + 1);
    printf("%x,%x", ptr1[-1], *ptr2);
    return 0;
}